Pneumatic valve



Z. LITTMAN.

PNEUMATIC VALVE.

APPLICATION FILED MAR 1. 1920.

Patented June 13, 1922.

ZENO LITTMAN, OF NEW YORK, N. Y., ASSIGNOR TO LITTMAN LOXAIR VALVE CORPO- RATION, A CORPORATION OF DELAWARE.

PNEUMATIC VALVE.

Specification of Letters Patent. Patgnted June 13, 1922.

. Application filed March 1, 1920. Serial No. 362,208.

To a]? 207mm if may concern Be it known that I. ZENO LITTMAN, a citi- Zen of the United States, residing at New York. in the county of New York and State of New York. have invented certain new and useful Improvements in Pneumatic Valves. of which the following is a specification.

The present invention is a valve of the type used with pneumatic tires and the ob jects ot' the invention are to provide a valve of this character which will be simple, practical. efiicient and relatively inexpensive, which can be readily applied to valve casings now in general use and in which the valve structure will be effectively sealed and leak age prevented.

In the accomplishment of the foregoing I have developed a number of novel features of construction. combinations and arrangements of parts. details of which will appear in the course of the following specification. reference being had to the accompanying drawing wherein I have illustrated but one of the simple embodiments of the invention.

In said drawing Figure 1. is a side view of the complete valve mechanism.

Figure 2 is a longitudinal sectional view of the valve structure, showing the valve proper in the inflation position.

Figure 3 is a vertical sectional view illustrating the several parts which go to make up the valve structure.

The valve casing designated 5 is of accepted or more or less standard construction comprising an externally threaded shank portion provided with a bore 6 therethrough and terminating at the outer end in a reduced and externally screw-threaded neck portion 7. The valve structure of my invention is adapted for direct application to this reduced neck portion of the valve casing.

Referring particularly to Figure 2 it will be seen that said valve structure comprises a tubular valve seat member 8 having at its lower end an upwardly or outwardly facing valve seat 9. opposed to which is a reversely or inwardly facing valve seat 10 carried by an outer tubular valve seat member 11. Between these two opposed valve seats there operates a double-ended valve 12. having as shown, conical valve portions at its oppositeends to cooperate with the respective valve seats.

The inner valve seat member is shown as secured in fixed relation to the end of the valve casing by a securing sleeve 13 internally screw-threaded at its lower end to fit the externally screw-threaded neck of the valve casing. This securing nut or -sleeve has an internal shoulder at 14 to engage the outer end of the valve seat member and the valve seat member is indicated as formed with a shoulder 15 to cooperate with the end of the valve casing and to limit the extent of seating of said member in the valve casing. Suitable packing washers 16 and 17 will usually be provided between the nut and the outer end of the valve seat member. and between the shoulder of the valve seat member and the end of the valve casing respectively. These packing elements may simply be in the form of washers of lead or other suitable material.

The outer valve seat member 11, is in the form of the invention illustrated. carried by an adjusting sleeve 18 internally threaded at its lower end as 'indicated to receive the screwthrea('led upper portion 19 of said valve seat member. This valve seat member is also shown as provided with an annular outstanding flange 20 forming a stop engaging the lower or inner end of the sleeve in which it is mounted.

The adjusting sleeve is shown as supported in the outer end of the securing sleeve 13 and a peculiar and novel feature of its connection with such securing sleeve it that such connection is made by a left-handed screwthread. the lower end of the adjusting sleeve being indicated at 21 as provided with an external left-hand screw-thread to engage the internal left-hand screw-thread indicated at 22 formed in the upper or outer end portion of the securing nut. The outer end of the adjusting sleeve is shown as formed with an external right-hand screw-thread 23 to receive the nipple usually provided at the end of the pump or pressure supply connection.

The result of the construction just described is that when the nipple is screwed onto the outer end of the adjusting sleeve, said sleeve will turn in a right-handed direction and this by reason of the left-hand screw-thread connection will cause the adjusting sleeve to move outwardly so as to carry the outer valve seat member and With it the valve, away from the inner valve seat. This is the condition illustrated in Figure 2, wherein the valve, except for the tension of {because of its rapid deterioration.

I employ lead or copper or some other comthe usual. holding spring 24 and the pressure within the bore 6, is free to open inwardly for the purpose of admitting fluid under pressure.

l Vhen the nipple is removed from the adjusting screw by unscrewing it in a lefthanded direction, the adjusting sleeve Wlll rotate left-handedly and will by the left handed screw connection carry the outer valve seat member and the valve inwardly so as to engage the inner end of the valve with the inner valve seat 9. Under these circumstances, a double seal is afforded, the valve is held positively closed and leakage or loss of pressure is thereby effectively prevented. If desired, the adjusting sleeve may be turned manually to accomplish the results described, it being for the purpose provided with a knurled finger hold portion 25.

The tension of the valve-closing spring 24 may be regulated in the illustration by turning the nut 26 on the threaded stem 27 of the valve, said nut forming the outer abutment for the spring which at its inner end bears against the shoulder providedby the outer end of the valve seat sleeve 11 (Figure 2).

The invention provides asimple, inexpensive and easily assembled valve mechanism which can be readily applied to valve casings now in general use and which valve mechanism is automatically released for inflation purposes by the application of a pressure connection thereto and is secured in sealed condition by .the simple act of removing the pressure connection.

It will be observed that theouter valveseat member 11 is movable longitudinally within the inner valve-seat member 8, under the control of the adjusting sleeve 18, and that when the two valve-seat members are in the Figure 2, or inflation position, movement of air between the threads 21 of the adjusting sleeve and threads 22 of the securing nut, and between the internal threads of the adjusting sleeve and the external threads 19 of the outer valve-seat member 11, is prevented by the packing 16; while packing 17 prevents escape of air between the cooperating threads of the securing nut and of the outer end of reduced portion 7 of the casing. In the other position of the telescoping valve-seat members, that is, when the member 11 is driven down towards the valve-seat 9, the valve 12 effectually seals against both valve-seats, 9 and 10, while the packings 16 and 17 remain in sealing positionand condition as before.

I prefer not to use rubber or the like as the material for these packings 16 and 17 Instead pressible or moldable metal or alloy; and

for the facing of the valve proper 12 I use some such metal as lead. Inthis way I seemme cure good seals, and, there is no such disintegration or other deterioration as is inevitable with rubber. In addition to its sealing function the packing 17, which ultimately surrounds the valve-seat member 8 and seats against the shoulder 15 thereof. has another important utility, in that when the valve-seat member 8 is positioned within the securing nut 13, the packing 17, purposelyof generous external diameter, is .forced over the lower or inner end of menu ber 8 until it reaches its final seat against shoulder, its outer periphery firmly engaged with the threads interiorly of the lower end of nut 13. Accordingly valve-seat member is held in proper assembled relation within the nut 13, ready for instant and effective application to the end of the valve-casing, the reduced thread end of which engages the interior threads at the lower end of nut 13, advancing spirally in the space between the interior of the nut and the outer surface of valve-seat member 8, until packing 17 is reached. Shoulder 15 thus provides a stop, and seat for packing 17, and defines the space between the securing nut and the body portion of valve-seat member 8 which is held concentric therein. And of course it makes a perfect seal between the end of the valve casing and the attaching nut 13.

The familiar valve-parts found in valve casings of tire valves now in general use may be removed in the usual way, and my attachment substituted, as described, without the use of special tools and with great facility.

lVhat I claim is: I

1. A pneumatic valve comprising a valve casing, a tubular element seated in said valve casing and having an outwardly facing valve seat, a nut securing said valve seat member to the valve casing, a tubular element carrying an inwardly facing valve seat opposed to the outwardly facing valve seat, a double-ended valve operable between said valve seats and a support for said second valve seat member having a threaded connection with the securing nut aforesaid and adjustable to carry said valve seat memher and with it the valve toward and away from the first valve seat member.

2. A pneumatic valve comprising a valve casing, a tubular element seated in said valve casing and having an outwardly facing valve seat, a nut securing said valve seat member to the valve casing, a tubular ele ment carrying an inwardly facing valve seat opposed to the outwardly facing valve seat, a double-ended valve operable between said valve seats and a support for said second valve seat member having a threaded connection with the securing nut aforesaid and adjustable to carry said valve seat member and with it the valve toward and away from the first valve seat member, said support having a left-hand screw connection with the securing nut and provided with a righthand scrmv-thread for engagement by a pressure supply nipple whereby in the application of said nipple to said support the support will be turned right-hamledly to remove the valve'from the inner valve seat and in the removal of the nipple the support will be turned left-handedly to carry the valve into engagement with the inner valve seat.

3. A pneumatic valve comprising a valve casing, a tubular element seated in said valve *asing and having an outwardly facing valve seat, a tubular element carrying an inwardly facing valve seat opposed to the first valve seat, a double-ended valve operable between said valve seats and a screw for shifting the second valve seat member inwardly to carry the same and with it the valve toward the inner valve seat or out wardly away from said inner valve seat.

4. In a device of the kind described, a tubular valve-seat member having a body portion intended to be inserted into the end of an ordinary tire-valve casing and an enlarged outer end defined by a shoulder, a tubular supporting member surrounding the valve-seat member and having an internal shoulder against which the end of the enlarged portion of the valv e-seat member abuts, and a lead-like metal packing ring surrounding the body portion of valve-seat member and resting against the shoulder thereof, the packing ring having frictional engagement with the interior surface of the supporting member and the exterior surface of the reduced portion of the valve-seat member, thereby firmly holding the valveseat member in position within the supporting member.

5. In a device of the kind described, a tubular valve-seat member having a body portion intended to be inserted into the end of an ordinary tire-valve casing and an enlarged outer end defined by a shoulder, a tubular supporting member surrounding the valve-seat member and having an internal shoulder against which the end of the enlarged portion of the valve-seat member abuts, a lead-like metal packing ring surrounding the body portion of the valve-seat member and resting against the shoulder thereof, the packing ring having frictional engagement with the interior surface of the supporting member and the exterior surface of the reduced portion of the valve-seat member, thereby firmly holding the valveseat member in position within the supporting member, and a second valve-seat member supported within the supporting member and longitudinally movable Within the first named valve-seat member.

6. In a device of the kind described, a tubular valve-seat member having a body portion intended to be inserted into the end of an ordinary tire-valve casing and an enlarged outer end defined by a shoulder, a tubular supporting member surrounding the valve-seat member and having an internal shoulder against which the end of the enlarged portion of the valve-seat member abuts, a lead-like metal packing ring surroluuling the body portion of the valveseat member and resting against the shoulder thereof, the packing ring having frictional engagement with the interior surface of the supporting member and the exterior surface. of the reduced portion of the valveseat member, thereby firmly holding the valve-seat member in position within the supporting member, a second valve-seat member supported within the supporting member and longitudinally movable within the first named valve-seat member, and a tubular member carried by the supporting member and surrounding the second-named valve-seat member and controlling the movement of the latter.

7. In a device of the kind described, a tubular valve-seat member having a body portion intended to be inserted into the end of an ordinary tire-valve casing and an enlarged outer end defined by a shoulder, a tubular supporting member surrounding the valve-seat member and having an internal shoulder against which the end of the enlarged portion of the valve-seat member abuts, a lead-like metal packing ring surrounding the body portion of the valve-seat member and resting against the shoulder thereof, the packing ring having frictional engagement with the interior surface of the supporting member and the exterior surface of the reduced portion of the valve-seat member, thereby firmly holding the valveseat member in position Within the supporting member, a second valve-seat member supported Within the supporting member and longitudinally movable within the first named valve-seat member, a tubular member carried by the supporting member and surrounding the second-named valve-seat member and controlling the movement of the latter, and means for preventing passage of air between the supporting member and the controlling member, and between the controlling member and the second-named valve-seat member.

8. In a device of the kind described, a tubular valve-seat member having a body portion-intended to be inserted into the end of an ordinary tire-valve casing and an enlarged outer end defined by a shoulder, a tubular supporting member surrounding the valve-seat member and having an internal shoulder against which the end of the enlarged portion of the valve-seat member abuts, a lead-like metal packing ring surrounding the body portion of the valve-seat member and resting against the shoulder thereof. the packing ring having frictional engagement with the interior surface of the supporting member and the exterior surface of the reduced portion of the valve-seat member. thereby firmly holding the valveseat member in position within the supporting member, a second valve-seat member supported within the supporting member and longitudinallv movable within the first named Valve-seat member, and a tubular member carried by the supporting member and surrounding the second-named valveseat member and controlling the movement of the latter, the controlling member having threaded engagement with the surrounding supporting member, and the second-named valve-seat member having threaded engagement with the surrounding controlling mem her, the threads comprising the respective threaded engagements being differential with respect to each other.

In testimony whereof I aflix my signature.

ZENO LITTMAN. 

